As the production planner for Xiangling Hu Products, Inc., you have been given a bill of material for a bracket that is made up of a base, two springs, and four clamps. The base is assembled from one clamp and two housings. Each clamp has one handle and one casting. Each housing has two bearings and one shaft. There is no inventory on hand.

$[4$ marks$]$

$1)$ Design a product structure noting the quantities for each item and show the low$-$level coding.

ii$)$ Determine the gross quantities needed of each item if you are to assemble $50$ brackets.